JP2777726B2 - Pest control agent and method for controlling pests in septic tanks - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a pest control agent for controlling pests such as sanitary pests and unpleasant pests generated in an aeration type septic tank (hereinafter sometimes simply referred to as a septic tank). And a method for controlling pests.

[Conventional technology]

In recent years, with the widespread use of septic tanks, hygiene pests such as mosquitoes and unpleasant pests such as fly have been generated from the septic tanks, which has become a problem.

Septic tanks are required to be maintained and inspected at regular intervals.However, when a worker performing maintenance and inspection opens a manhole, it may fly into the worker's face if there is a fly or flea fly, Since it enters the mouth and nose and interferes with work, its control is desired.

In addition, since mosquitoes generated in the septic tank enter the room from the septic tank and stab people, and unpleasant pests such as flies fly on the indoor walls and cause discomfort to humans, it is desired to control them.

Conventionally, as a method of controlling sanitary pests and unpleasant pests generated in a septic tank as described above, a method of suspending a DDVP plate containing DDVP in a plate-like impregnated body in the septic tank to control adults, or an organic phosphorus or pyrethroid A method of directly spraying or spraying an oil agent containing a pesticidal component as an active ingredient into the septic tank or extinguishing it with fumes, and adding an organic phosphorus-based or pyrethroid-based insecticide or an insect growth inhibitor such as methoplain to the wastewater of the septic tank. A method of controlling larvae by spraying an emulsion as an active ingredient, a water solvent, and a wettable powder is known.

[Problems to be solved by the invention]

There are various types of septic tanks for purifying sewage such as human waste and domestic wastewater from households.In recent years, all-aeration-type septic tanks that separate air by sending air into sewage, and septic tanks for separate aeration are commonly used in households. Widespread. DDVP plates are used to eliminate pests generated in such aeration-type septic tanks.However, the air sent into the sewage is sent into the septic tank and the indoor air in the septic tank leaks outside. Also, there is a problem that the chemicals evaporating from the DDVP plate leak to the outside and do not reach the effective concentration, and the pests in the septic tank cannot be effectively eliminated. Furthermore, for the purpose of exterminating adult pests generated in the septic tank, a method of directly spraying or fogging an organic phosphorus-based oil or a pyrethroid-based oil into the septic tank is known. However, although the adults in the septic tank can be exterminated, the larvae and pupae cannot be completely exterminated, so that the adults emerge from the larvae and pupae, and the effect cannot be maintained for a long time. Further, in order to completely perform the control, the number of times of direct spraying or fogging in the septic tank needs to be increased several times in one to three weeks, which is a problem that it is troublesome.

Further, as a method for exterminating larvae, a method of spraying an organic phosphorus-based or pyrethroid-based insecticide as an active ingredient, an aqueous solvent, a wettable powder, or a wettable powder containing metoprene as an active ingredient in sewage water. However, it is known that the fly larvae grow in the sewage by repeating actions such as entering the sewage and climbing up from the sewage to the wall of the septic tank and the scum. Did not. However, spraying at a high concentration adversely affects the activated sludge by the emulsifier and solvent contained in the chemical, and may cause the loss of the function of the septic tank.
There is a problem that the setting of the spray amount is very difficult, and not everyone can easily spray. It is said that a septic tank that treats only human waste from ordinary households uses 50 liters of water per person per day, and a septic tank that processes not only human waste but also domestic wastewater uses 200 liters of water per person per day. The emulsion, water solvent, and wettable powder sprayed on the sewage in the septic tank are evenly dispersed in the sewage, so that the amount of water that has newly entered the septic tank is discharged together with the sewage, reducing the drug concentration and reducing the insecticidal effect. There was a problem that it did not last for a long time. In addition, water must be used for several hours after the application of the medicine in order to improve the extermination effect, and there is a problem that it is very inconvenient to live.

As described above, although there are various methods for controlling various pests generated in the septic tank, a control method that can be sufficiently satisfied in terms of control effect, sustainability of control effect, influence on activated sludge, and the like. There was no.

Therefore, a main object of the present invention is to control a sanitary pest, an unpleasant pest, and the like generated and inhabiting a septic tank with a relatively small amount of a chemical, and furthermore, a single-spraying insect pest-controlling agent for a long-term control effect. And a method for controlling pests.

Another object of the present invention, in connection with the above object, is to provide a pest control agent and a pest control method for a septic tank which can be easily used by anyone without losing the essential function of the septic tank.

[Means for solving the problem]

According to the present invention, there is provided a pesticidal agent for an aeration-type septic tank, characterized in that a liquid substance that is insoluble in water and floats on water contains 0.05 to 10% by weight of an insect growth inhibitor. You.

According to the present invention, the pesticide further comprises, 0.05
The above pesticidal composition is provided, which contains -10% by weight of an insecticide.

Further, according to the present invention, a pesticide comprising 0.05 to 10% by weight of an insect growth inhibitor contained in a liquid substance that is insoluble in water and floats on water is provided in an amount of 1.0 to 50 ml per 1 m ^{2 of} sewage area. A method for controlling pests in an aeration-type septic tank, which is sprayed, is provided.

According to the present invention, the pesticide further comprises, 0.05
The method for controlling pests according to the above, which comprises 害 10% by weight of the insecticide.

[Function and Mode of the Invention]

The present inventors have conducted intensive studies on a method for controlling various pests generated and inhabiting in a septic tank, and as a result, from the relationship between the ecology of various pests generated and inhabiting in a septic tank and the structure of the septic tank, they are insoluble in water and By using an insect growth inhibitor or an insecticide in combination with a liquid substance floating in water, an emulsion of a conventional organic phosphorus-based or pyrethroid-based insecticide,
It has been found that various pests can be controlled more efficiently and for a longer time than water solvents, wettable powders and the like. Furthermore, by using the liquid substance in combination with an insect growth inhibitor or an insecticide, a sufficient control effect can be obtained even when the amount of the insect pest inhibitor or the insecticide used is reduced, and the activated sludge is completely eliminated. Has been found to have no effect.
The present invention has been completed based on such findings, and is characterized in that an insect growth inhibitor or an insecticide is dissolved in a liquid substance which is insoluble in water and floats on water, and is treated in a septic tank.

To explain the action of the present invention in relation to the ecology of various pests, as described above, larvae of pests grow while repeating behaviors such as entering sewage and crawling from sewage to the wall or scum of a septic tank. . Therefore,
When the pesticidal agent of the present invention is sprayed or sprayed on sewage in a septic tank, the drug floats on the surface of the sewage, makes efficient contact with the larvae of various pests inhabiting the surface of the sewage or scum, It grows to pupae but does not emerge. Therefore, the number of insects in the septic tank is reduced, and the control effect can be improved. Further, even in a septic tank that sends air to and aerates sewage, the chemical is always floating on the surface of the sewage, so that it does not affect activated sludge in the clarifier and does not lose its function. Further, since the drug is constantly floating on the surface of the wastewater, the opportunity for the insect growth inhibitor, which is an active ingredient, to come into contact with alkaline components such as human waste and microorganisms is reduced, decomposition is further suppressed, and the control effect is maintained for a long time. .

Next, the operation of the present invention will be described in relation to the structure of the septic tank.

As an example of the structure of the septic tank, the structure of the separation and aeration type septic tank is shown in Fig. 1 and the structure of the total aeration type of the septic tank is shown in Fig. 2. The chamber of the separation and aeration type septic tank 1 is a sedimentation separation chamber A, an aeration type B and a sedimentation chamber. C, the disinfecting room E is divided into four chambers, and the sewage 2 flows from the sedimentation separation room A to the aeration type B, the sedimentation room C, and the disinfection room E in the direction of the arrow. In the figure, D is a disinfectant tank, 3 is a blower, 4 is an air diffuser, 5 is a manhole, 6 is a scum (floating matter), and 7 is a bubble. Since the sewage 2 is designed to flow from the bottom of the tank to the next room, even if new human waste or domestic wastewater enters, the chemicals floating on the surface of the sewage will be transferred to the next room and discharged. The drug stays forever and its efficacy can last for a long time.

On the other hand, as shown in FIG. 2, the chamber of the total aeration type purification tank 10 is divided into three chambers of an aeration type B, a sedimentation chamber C and a disinfection chamber E, and the wastewater 2 is transferred from the aeration type B to the sedimentation chamber C. After flowing through the bottom, the activated sludge is settled and separated in the sedimentation chamber C, and then disinfected in the disinfection chamber E and discharged. The drug floating on the surface of the aeration type B is not transferred to the next chamber C and is not discharged, and the drug stays in the aeration type B forever as in the case of the separation type septic tank, and the efficacy can be maintained for a long time. .

Hereinafter, the pest control agent and the pest control method of the present invention will be specifically described. Examples of the liquid substance insoluble in water and floating in water according to the present invention include aliphatic hydrocarbons such as kerosene and kerosene. For example, commercially available products such as No. 0 Solvent H (manufactured by Nippon Oil Co., Ltd.) and No. 0 Solvent M ( Nippon Oil Co., Ltd.), IP Solvent 2028 (Idemitsu Petrochemical Co., Ltd.)
Etc. can be used. In addition, oils and fats such as olive oil, rapeseed oil, sesame oil and the like are insoluble in water and listed as liquid substances floating in water, but are not limited thereto.

Examples of the insect growth inhibitor include 2- [1-methyl-2
-(4-phenoxyphenoxy) ethoxy] pyridine (generic name pyriproxyfen, hereinafter referred to as pyriproxyphene), 11-methoxy-3,7,11-trimethyl-2,4
-Dodecadienoic acid-1-methylethyl ester (generic name: methoprene; hereinafter, referred to as methoprene); ethyl-3,7,11-trimethyl-2--4-dodecadienoate (general name: hydroprene; 1- (4-chlorophenyl) -3- (2,6-difluorobenzoyl) urea (generic name diflubenzuron)
And the like.

In addition, since the insect growth inhibitor acts as an inhibitor of emergence from the pupa and has no insecticidal effect on adults, conventional insecticides such as organophosphorus insecticides, pyrethroid insecticides, Carbamate insecticides can be included. For example, organophosphorus insecticides such as funitrothion, tyazinone, dichlorvos, malathion, pyridafenthion, etc., pyrethroid insecticides such as arethrin, phthalthrin, exmin, smithulin, resmethrin, etc., and carbamate insecticides such as propoxer, methoxadiazon etc. These may be used alone or in combination of two or more.

As a method of treating the septic tank, the liquid as it is may be sprayed or dropped on the sewage of the septic tank, but if necessary, an aerosol mixed with a propellant may be sprayed into the septic tank. You can also.

Examples of the propellant include propellants such as liquefied petroleum gas, dimethyl ether, and fluorocarbon. These propellants may be used alone or in combination of two or more.

The concentration that dissolves the insect growth inhibitor in a liquid substance that is insoluble in water and floats in water and the amount to be treated in the septic tank may be appropriately determined depending on the dosage form, the type of the septic tank, and the use scene, and are not particularly limited. Absent. For example, an insect growth inhibitor is usually added to a liquid substance that is insoluble in water and floats on water in an amount of about 0.05 to 10% by weight,
Preferably, about 0.5 to 5.0% by weight is blended.
When a pesticide is blended, sufficient efficacy can be obtained at the same concentration. Further, the amount to be sprayed or sprayed on the septic tank is preferably 1.0 to 5 ml, more preferably about 5.0 to 20.0 ml per 1 m ² of the area of the sewage in the septic tank.

〔Example〕

Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples.

Examples 1 to 4 and Comparative Example 1 A kerosene solution containing an insect growth inhibitor and a 5% vitex (fenthion) emulsion were sprayed on a 10-liter artificial medium, and the persistence of the eclosion inhibitory effect on the fly larvae was examined. The embodiments are as follows.

Test agent: NO1: Pyroproxyfen 0.5 g with kerosene 100
Oil NO2: Hydroprene 0.5 g prepared in 100 ml with kerosene
Oil agent NO3: Emulsion containing 5% (W / W) of fenthion Spraying method: Example 1 A test agent (NO1) was sprayed so that pyriproxyfen was 1.0 ppm in 10 liters of artificial sewage. .

Example 2 A test agent (NO1) was sprayed so that pyriproxyfen was 0.1 ppm in 10 liters of artificial wastewater.

Example 3 10 liters of artificial sewage was hydroprene
The test agent (NO2) was sprayed to 1.0 ppm.

Example 4 Hydroprene was added to 10 liters of artificial sewage.
The test agent (NO2) was sprayed so as to be 0.1 ppm.

Comparative Example 1 Fention was added to 10 liters of artificial wastewater.
The test agent (NO3) was sprayed to be 0 ppm.

Outline of operation: The test agent was sprayed to a predetermined concentration in a container containing 10 liters of artificial sewage. On the 1st, 15th, 1st, 2nd and 3rd months, 500 terminal fly larvae reared in the artificial sewage were bred successively, and the number of adults that emerged therefrom was examined. . At the same time, a similar test was performed using artificial sewage without spraying a chemical, and a non-treated section was obtained. Test 3
The measurement was repeated twice and the average value was determined. Table 1 shows the results.

As is clear from the results shown in Table 1, in the conventional spraying method (Comparative Example 1), on the first day after the spraying, the terminal larva of Drosophila died and no adult that emerged was observed. On day 15, 68% of the adults emerged. from this result,
With the conventional spraying method, almost 15 days after spraying, almost no chemical was found in the sewage in the septic tank, indicating that long-term residual efficacy cannot be expected. On the other hand, in Examples 1 to 4 of the present invention, a sufficient emergence preventing effect is recognized even after 3 months from the spraying, and it can be seen that the agent remains stably on the surface of the wastewater and the extermination effect is maintained for a long time. .

Example 5 and Comparative Example 2 The method of the present invention in which a kerosene solution containing an insect growth inhibitor was sprayed on wastewater (Example 5) and the conventional treatment method in which a diazinon emulsion was sprayed on wastewater (Comparative Example 2) were carried out. Then, the persistence of the pest control effect in the septic tank at that time was compared with the effect on protozoa living in the septic tank. The embodiments are as follows.

Test agent: NO1: Pyroproxyfen 0.5 g with kerosene 100
oil prepared in ml NO2: emulsion spraying method containing 5% of diazinon: Example 5 septic tank wastewater area 1 m ² per test preparation of (NO1) 20
ml was sprayed.

Comparative Example 2 The test agent (NO2) was sprayed so as to be 1 ppm as an active ingredient per 1 t of sewage in a septic tank (23 g of an emulsion was diluted 200 times and sprayed).

Implementation outline: Separation and aeration type septic tank (Hitachi KR-5, 5-person tank 1.14ton)
The test agent was sprayed into the sedimentation separation chamber and the aeration chamber, and 250 liters of water and 1 kg of an artificial medium were poured into the sedimentation separation chamber every day. Thereafter, 50 ml of sewage from both the sedimentation separation chamber and the aeration chamber of the septic tank was placed in a polycup, and 50 terminal fly larvae of the Drosophila bred successively were placed therein, and the number of adults that emerged therefrom was examined. The test was repeated three times, and the average value was determined.
Table 2 shows the results. In addition, the activated sludge in the aeration chamber before and after spraying the test agent was collected, and the number of protozoa in the activated sludge was investigated. The results are shown in Table 3.

As is clear from the results shown in Table 2, in the conventional spraying method (Comparative Example 2), on the first day after spraying, the terminal larva of Drosophila died and no adult flapping was observed, but after spraying, On the 15th day, most adult larvae emerged from the terminal larvae of Drosophila, and no long-term control effect was observed. From this result, it can be seen that in the conventional spraying method (Comparative Example 2), the chemical in the sewage has already disappeared 15 days after spraying. In the case of the treatment method of the present invention (Example 5), since the chemical remained on the surface of the sewage without being discharged from the septic tank until three months after the treatment, a sufficient control effect was recognized for three months. In addition, comparing the change in the number of protozoa in the sewage before and after spraying, the number of protozoa was significantly reduced by the conventional spraying method (Comparative Example 2), and the effect of spraying the drug was recognized. However, in the treatment method of the present invention (Example 5), no change was observed in the number of protozoa, and it was found that the septic tank function was not lost.

Examples 6, 7 and Comparative Examples 3, 4, 5 A method of the present invention (Example 6) in which a solution containing an insect growth inhibitor and an insecticide and an aerosol filled with gas are sprayed into a septic tank, and an insect growth inhibitor Of the present invention in which an aerosol filled with a solution containing only a gas and a gas is sprayed into a septic tank (Example 7), a method of spraying an emulsion containing an insect growth inhibitor as an active ingredient (Comparative Example 3), and a sprayer of Sumithion oil The conventional spraying method (Comparative Example 4) in which the spraying was carried out, and the conventional spraying method in which the DDVP plate was hung (Comparative Example 5) were carried out in a septic tank of a general household, and pest control was compared. The embodiments are as follows.

Test agent: NO1: Dissolve 1.0 g of pyriproxyfen and 0.2 g of d-T80 resmethrin in IP solvent 2028 (180 ml), and add DME / L
Aerosol filled with PG gas (120ml).

NO2: 1.0 g of pyriproxyfen IP solvent 20
Aerosol dissolved in 28 (180 ml) and filled with DME / LPG gas (120 ml) (220 g per can) NO3: Emulsion containing 5% (W / W) of pyriproxyfen NO4: 1% of fenitrothion (W / W) oil containing NO5: DDVP a 16g / sheets containing plates spraying method: the sewage area 1 m ² per test preparation of example 6 Septic (NO1) 10
The spraying was performed for 2 seconds (the spray amount for 10 seconds was about 25 g).

Example 7 10 ml of test agent (NO2) per 1 m ² of sewage area of septic tank
The spraying was performed for 2 seconds (the spray amount for 10 seconds was about 25 g).

Comparative Example 3 2.3 g of a test agent (NO3) was added to sewage in a septic tank with water so that pyriproxyfen would have the same dosage as in Example 7.
It was diluted by a factor of 1 and sprayed.

Comparative Example 4 septic tank wastewater area 1 m ² per test preparation of (NO4) 50
ml was sprayed directly.

Comparative Example 5 One test agent (NO5) was hung in a septic tank.

Summary of treatment: Separated aeration type septic tank (Hitachi KR-7, 1.4-ton tank for 7 persons) and whole aeration type septic tank (Hitachi M-75B, 0.9t) where the drosophila is generated. The population of adult Drosophila emanating from the septic tank was investigated. Table 4 shows the results. In addition, the meaning of the individual number display code in the table is as follows.

Number of individuals ++ 200 or more adults in septic tank + 20 to 199 adults in septic tank ± 1 to 19 adults in septic tank-0 adults in septic tank As shown in Table 4, in the method of the present invention (Example 6), the number of adult fly flies decreased on the first day after the chemical treatment, and thereafter the occurrence of the fly was suppressed for 3 months, and long-term control was observed. Was done.

Also, in the method of the present invention (Example 7), although the decrease of adult flies was not observed on the first day after the treatment, the occurrence of adult flies was low from the 15th day to 3 months after the treatment. , And a long-term control effect was observed.

On the other hand, in Comparative Example 3 in which the emulsion in which the insect growth inhibitor was uniformly dispersed in the sewage was sprayed, although the number of adults of Drosophila gradually decreased after the spraying of the drug, two months after the treatment, Recovers to +, and ++ recovers 3 months after treatment,
Long-term control was not possible.

The reason for this is that since new sewage flows in every day, the uniformly dispersed drug moves to the next chamber, and is eventually discharged, the drug concentration gradually decreases, and the drug solution disappears. Probable cause.

In Comparative Example 5 which is a conventional treatment method, since air was sent into the septic tank, the chemicals volatilized from the plate leaked to the outside of the septic tank, and did not reach an effective concentration enough to eliminate the fly. Little effect was observed during the period.

〔The invention's effect〕

ADVANTAGE OF THE INVENTION According to the pest control agent and the pest control method of the present invention, since the sprayed drug and the larvae of the pests have the same habitat, the pests come into contact with the drug efficiently and have an excellent control effect even when the amount of the drug used is reduced. Is obtained. Further, from the viewpoint of the septic tank structure, when the chemical is on the surface of the sewage, the chemical does not migrate to the next chamber, and when the chemical is on the surface of the sewage, it is difficult to decompose, so that the control effect can be maintained for a long time. As still another effect, since the chemicals remain on the surface of the wastewater, there is no effect on the activated sludge, and anyone can easily spray the sludge on the septic tank.

In addition, by using an insecticide together with the insect growth inhibitor, the effect of inhibiting the emergence of the insect pest from the pupa and the effect of killing the adult insects are synergistically exerted, and an extremely effective and long-term insect-control effect can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a separation aeration type septic tank, and FIG. 2 is a schematic configuration diagram of a full aeration type septic tank. A is a sedimentation separation room, B is an aeration room, C is a sedimentation room, D is a disinfection room, 1 is a separate aeration type septic tank, and 10 is a full aeration type septic tank.

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-49-132235 (JP, A) JP-A-47-98 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) A01N 25 / 00,25 / 00 101,25 / 02 C02F 3/00

Claims (4)

(57) [Claims] (1) a liquid substance which is insoluble in water and floats on water,
A pesticidal composition for an aeration-type septic tank, comprising an insect growth inhibitor in an amount of up to 10% by weight. 2. The pesticidal composition according to claim 1, wherein said pesticide further contains 0.05 to 10% by weight of an insecticide. 3. A liquid substance which is insoluble in water and floats on water,
The pest control agent formed by incorporating a 10 wt% of an insect growth inhibitors, pest control method of aeration type septic tank, characterized in that the area of 1 m ² per 1.0~50ml scatter sewage. 4. The method of controlling pests according to claim 3, wherein said pesticide further contains 0.05 to 10% by weight of an insecticide.